Opin vísindi

The effect of fluid compressibility and elastic rock properties on deformation of geothermal reservoirs

Show simple item record

dc.contributor Háskóli Íslands
dc.contributor University of Iceland
dc.contributor.author Juncu, Daniel
dc.contributor.author Arnadottir, Thora
dc.contributor.author Geirsson, Halldor
dc.contributor.author Gunnarsson, Gunnar Th
dc.date.accessioned 2020-09-08T15:48:53Z
dc.date.available 2020-09-08T15:48:53Z
dc.date.issued 2019-01-09
dc.identifier.citation D Juncu, Th Árnadóttir, H Geirsson, G Gunnarsson, The effect of fluid compressibility and elastic rock properties on deformation of geothermal reservoirs, Geophysical Journal International, Volume 217, Issue 1, 1 April 2019, Pages 122–134, https://doi.org/10.1093/gji/ggz011
dc.identifier.issn 0956-540X
dc.identifier.issn 1365-246X (eISSN)
dc.identifier.uri https://hdl.handle.net/20.500.11815/2053
dc.description Publsiher's version (útgefin grein)
dc.description.abstract The characterization of magnetic minerals in rocks often uses methods that measure induced magnetization. When rocks, sediments or soils contain two magnetic phases, in which one has a high saturation magnetization (MS), for example magnetite, and the other a low MS, for example hematite, the induced magnetization will be dominated by the stronger phase. An earlier study by Frank and Nowaczyk has shown that even when magnetite makes up <10 wt per cent of the ferromagnetic content, it will mask hematite. This makes identification of phases with low MS difficult to identify. We conduct a systematic study of synthetic mixtures of single domain magnetite and hematite with a broad spectrum of particle size, using hysteresis properties, acquisition of isothermal remanent magnetization (IRM) and first-order reversal curve distributions (FORC). Hysteresis parameters and FORC distributions do not vary significantly from the pure magnetite sample for hematite concentrations =90 wt per cent. IRM is not saturated for hematite concentration of 30 wt per cent or higher. Principle component analysis (PCA) of the processed FORCs, detects the presence of hematite for concentrations 70 wt per cent at the very least. Our results illustrate the difficulty in identifying hematite when it is found together with magnetite. IRM acquisition is the most sensitive method for identifying hematite when it occurs together with magnetite. © 2019 The Author(s).
dc.description.sponsorship We would like to thank Andrew Hooper (University of Leeds), Björn Lund (Uppsala University), Sigurjón Jónsson (King Abdullah University of Science and Technology), Ólafur Flóvenz (Iceland GeoSurvey) and Freysteinn Sigmundsson (University of Iceland) for their helpful comments on the manuscript. Comments from the editor (Michael Ritzwoller) and two anonymous reviewers were highly appreciated and helped to improve this paper. COMET is the NERC Centre for the Observation and Modelling of Earthquakes, Volcanoes and Tectonics. This work was supported in part by grants from the Iceland Research Fund (grant numbers 130371-051/052/053 and 174377-051) and the University of Iceland Research Fund (grant number HI-6489).
dc.format.extent 122-134
dc.language.iso en
dc.publisher Oxford University Press (OUP)
dc.relation.ispartofseries Geophysical Journal International;217(1)
dc.rights info:eu-repo/semantics/openAccess
dc.subject Seismology
dc.subject Creep and Deformation
dc.subject Elasticity and Anelasticity
dc.subject Geomechanics
dc.subject Hydrothermal Systems
dc.subject Jarðskjálftafræði
dc.subject Jarðhitasvæði
dc.title The effect of fluid compressibility and elastic rock properties on deformation of geothermal reservoirs
dc.type info:eu-repo/semantics/article
dcterms.license This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
dc.description.version Peer Reviewed
dc.identifier.journal Geophysical Journal International
dc.identifier.doi 10.1093/gji/ggz011
dc.relation.url http://academic.oup.com/gji/article-pdf/217/1/122/27662364/ggz011.pdf
dc.contributor.department Jarðvísindastofnun (HÍ)
dc.contributor.department Institute of Earth Sciences (UI)
dc.contributor.school Verkfræði- og náttúruvísindasvið (HÍ)
dc.contributor.school School of Engineering and Natural Sciences (UI)

Files in this item

This item appears in the following Collection(s)

Show simple item record